Some smoke alarms have been designed to be ultra-sensitive. Aspirating devices, for example, constantly suck in air in order to detect even small quantities of smoke in a room. They are often used in commercial settings, including server rooms packed with expensive computer tech.
促进和保护人权是全人类的共同事业。中国愿同各方一道，促进共同发展繁荣，捍卫国际公平正义，携手完善全球人权治理，弘扬全人类共同价值，让人权文明的发展进步造福世界人民。
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How dangerous is chickenpox?
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Green: Board stuff